Featuring Grade 10 chromium steel balls and vacuum de-gassed 52100 high-carbon chromium alloy races, this ABEC 3 precision bearing delivers exceptional smoothness and durability. The mirror-polished races reduce rolling resistance, while the C3 internal clearance allows for thermal expansion and press-fit tolerances without binding.
Designed to withstand harsh riding conditions, it features dual-lip 2RS rubber seals that create a full labyrinth barrier to block water, dirt, and trail grime. Packed with high-pressure, water-resistant synthetic grease, it provides long-lasting, quiet performance for weight-conscious componentry.
ABEC 3 Precision Rating: Grade 10 chromium steel balls and mirror-polished 52100 alloy races ensure quiet, low-friction rolling.
Dual-Lip 2RS Rubber Seals: Provides full labyrinth protection to keep trail contamination out and synthetic grease locked in.
C3 Internal Clearance: Allows for optimal tolerance under press-fit loads and high-rpm thermal expansion.
Dimensions: 15 mm (Inner Diameter) x 21 mm (Outer Diameter) x 4 mm (Width)
Precision Rating: ABEC 3
Material: 52100 High-Carbon Chromium Alloy Steel
Seal Type: 2RS (Dual-lip rubber seals on both sides)
Clearance: C3
✅ Precision Freehub Upgrade: Ideal for lightweight hubs and freehub bodies requiring a ultra-thin 15x21x4 mm profile.
✅ Weatherproof Durability: Dual rubber seals protect against dirt and water ingress during wet riding conditions.
✅ Smooth Low-Friction Operation: ABEC 3 tolerances and mirror-polished races minimise drag in critical drivetrain components.
❌ Heavy Suspension Pivots: Ultra-thin radial bearing profile is not suitable for high-load, oscillating suspension linkages.
❌ Ceramic Seeking Riders: Riders looking for extreme drag reduction or zero-corrosion ceramic balls should consider Enduro's Ceramic Hybrid options.
❌ Incorrect Hub Sizing: Ensure your specific hub or freehub mechanism calls for the thin-section 6702 size (15 x 21 x 4 mm).
Due to the ultra-thin 4 mm cross-section of 6702 bearings, extreme care must be taken during installation. Always use a precision bearing press with a blind-hole collet or drift that contacts only the outer race. Pressing against the inner race or seals on such a thin bearing can easily distort the races and cause immediate premature wear!
